The Cu Chi Tunnels are seventy five miles of interconnecting tunnels that were used by the Vietnamese navy throughout the Vietnamese War (or American War since they call it). They served as hiding spots and as routes for interaction and supplies. Quite a few troopers even lived in these tunnels https://sai-gon-list51482.post-blogs.com/51745059/the-2-minute-rule-for-sai-gon